Can't compile Arduino CapSense example

I'm trying to work with the CapSense library for Arduino. However, I can't manage to run the example included with the package, called "CapSenseSketch". When I try just opening the file and running it (I've tried both Arduino 1.0 and 1.0.1), I get a compiler error that says 'CapSense does not name a type", and also

CapSenseSketch.cpp:1:22: error: CapSense.h: No such file or directory
CapSenseSketch:11: error: 'CapSense' does not name a type
CapSenseSketch:12: error: 'CapSense' does not name a type
CapSenseSketch:13: error: 'CapSense' does not name a type
CapSenseSketch.cpp: In function 'void setup()':
CapSenseSketch:17: error: 'cs_4_2' was not declared in this scope
CapSenseSketch.cpp: In function 'void loop()':
CapSenseSketch:24: error: 'cs_4_2' was not declared in this scope
CapSenseSketch:25: error: 'cs_4_6' was not declared in this scope
CapSenseSketch:26: error: 'cs_4_8' was not declared in this scope

There is an include statement at the top of the code,

#include <CapSense.h>

and I thought that would be the problem, so I changed the brackets to quotes and still got an error saying "Error compiling" and:

CapSenseSketch.cpp.o: In function `__static_initialization_and_destruction_0':
CapSenseSketch.cpp:15: undefined reference to `CapSense::CapSense(unsigned char, unsigned char)'
CapSenseSketch.cpp:16: undefined reference to `CapSense::CapSense(unsigned char, unsigned char)'
CapSenseSketch.cpp:17: undefined reference to `CapSense::CapSense(unsigned char, unsigned char)'
CapSenseSketch.cpp.o: In function `loop':
CapSenseSketch.cpp:28: undefined reference to `CapSense::capSense(unsigned char)'
CapSenseSketch.cpp:29: undefined reference to `CapSense::capSense(unsigned char)'
CapSenseSketch.cpp:30: undefined reference to `CapSense::capSense(unsigned char)'
CapSenseSketch.cpp.o: In function `setup':
CapSenseSketch.cpp:21: undefined reference to `CapSense::set_CS_AutocaL_Millis(unsigned long)'

Any ideas? I've worked with CapSense on another computer and changing the brackets to quotes worked fine that time, but it doesn't seem to be doing much now.

Apparently including external files works a bit differently in the arduino ide. It's not enough to simply have an include statement at the top of your code, you must instead manually go to sketch > add file for every external file you want to use. In my case, I only did this for one out of the two files I was trying to use.